When you have an awkward boner and cannot keep it in your pants any longer and there isn't a bathroom near by, so you whip it out and pretend you're taking a piss but secretly wank in the bush.
Dan: "Liam mate are you having a wank in the bush?"
Liam: "Na mate just taking a piss, being holding it in all day!"
by professor oi oi July 29, 2016
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